February  2019, 24(2): 831-849. doi: 10.3934/dcdsb.2018209

Boundedness in a three-dimensional Keller-Segel-Stokes system involving tensor-valued sensitivity with saturation

1. 

College of Mathematics and Statistics, Chongqing University, Chongqing 401331, China

2. 

Department of Applied Mathematics, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

3. 

College of Economic Mathematics, Southwestern University of Finance and Economics, Chengdu 611130, China

* Corresponding author: liwadanj@126.com

Received  October 2017 Revised  March 2018 Published  June 2018

Fund Project: The first author is partially supported by graduate research and innovation foundation of Chongqing, China (Grant No. CYB 17040). The second author is partially supported by NSFC (Grant Nos. 11771062, 11571062), the Basic and Advanced Research Project of CQC-STC (Grant No. cstc2015jcyjBX0007) and Fundamental Research Funds for the Central Universities (Grant Nos. 10611CDJXZ238826). The third author is partially supported by National Science Foundation of China (Grant Nos. 11601053, 11526042). The fourth author is partially supported by the Fundamental Research Funds for the Central Universities (Grant No. JBK1801059)

This paper deals with a boundary-value problem for a coupled chemotaxis-Stokes system with logistic source
$\begin{eqnarray*}\left\{\begin{array}{llll}n_t+u·\nabla n = \nabla·(D(n)\nabla n)-\nabla·(n \mathcal{S}(x, n, c)·\nabla c)\\ +ξ n-μ n^{2}, &x∈ Ω, &t>0, \\c_{t}+u·\nabla c = Δ c-c+n, &x∈Ω, &t>0, \\u_{t}+\nabla P = Δ u+n\nablaφ, &x∈Ω, &t>0, \\\nabla· u = 0, &x∈Ω, &t>0\end{array}\right.\end{eqnarray*}$
in three-dimensional smoothly bounded domains, where the parameters $ξ\ge0$, $μ>0$ and $φ∈ W^{1, ∞}(Ω)$, $D$ is a given function satisfying $D(n)\ge C_{D}n^{m-1}$ for all $n>0$ with $m>0$ and $C_{D}>0$. $\mathcal{S}$ is a given function with values in $\mathbb{R}^{3×3}$ which fulfills
$ \begin{equation*}{\label{1.3}}\begin{split}|\mathcal{S}(x, n, c)|\leq C_{\mathcal{S}}(1+n)^{-α}\end{split}\end{equation*}$
with some $C_{\mathcal{S}}>0$ and $α>0$. It is proved that for all reasonably regular initial data, global weak solutions exist whenever $m+2α>\frac{6}{5}$. This extends a recent result by Liu el at. (J. Diff. Eqns, 261 (2016) 967-999) which asserts global existence of weak solutions under the constraints $m+α>\frac{6}{5}$ and $m\ge\frac{1}{3}$.
Citation: Dan Li, Chunlai Mu, Pan Zheng, Ke Lin. Boundedness in a three-dimensional Keller-Segel-Stokes system involving tensor-valued sensitivity with saturation. Discrete & Continuous Dynamical Systems - B, 2019, 24 (2) : 831-849. doi: 10.3934/dcdsb.2018209
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